Improve validation of 'name' and 'code' parameters for lint messages

Summary: Ref T9145. Fixes T9316. We now require "name" and "code" has a maximum length (currently, this is 32, but the next diff will raise it to 128).

Test Plan:

• Installed PHPCS.
• Hit both the "name" and "code" issues.
• Applied this patch.
• Got better errors sooner.

Reviewers: chad

Reviewed By: chad

Subscribers: aik099

Maniphest Tasks: T9145, T9316

Differential Revision: https://secure.phabricator.com/D14165